JPH1029067A - Protective sheet for welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working safety by taking in a welding spark once through melting/piercing of a sheet surface part and then cooling to receive the spark without bouncing back in the protective sheet for welding. SOLUTION: The spark penetrated into the inside of a spark taking-in layer 1, while losing heat by its melting, reaches to a base layer 2 made of a heat resistant material. The spark (scale, etc.) is fixed in the inside of spark taking-in layer 1 through cooling the spark taking-in layer 1. The surface of this spark taking-in layer 1, after using several times, is covered with many holes through spark piercing, the layer is discarded. When the spark taking in layer 1 is made of a foamed material 1c, whenever sparks successively melt/pierce an air bubble of the foamed material 1c, cooling is easily progressed and gradual deceleration effect is expected, bouncing back prevention effect is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective sheet for welding, and more particularly to a protective sheet for welding at various work sites requiring welding.
The present invention relates to a welding protection sheet used for protection against sparks generated during welding.

[0002]

2. Description of the Related Art Welding is broadly divided into fusion welding and pressure welding. Gas welding and arc welding are generally used in construction sites, shipbuilding operations and the like. In any of these technologies, a large amount of sparks are generated during welding (fusing). These sparks (including the scattering of scales) are generated from high-temperature parts and have the property of jumping relatively far, which is extremely dangerous. In addition to the problem of visual impairment due to high-temperature colors, burns and fire This is a major problem in welding that causes welding.

[0003] The scattering of such sparks is currently abandoned. For example, in a building construction site, when performing welding or fusing work on a floor, workers nearby, especially workers on the lower floors. Has stopped working temporarily and evacuated to the safety belt. In addition to the danger of human beings, there is also a danger that the scattered sparks may ignite other combustible materials, for example, paints and woods, causing a fire.

[0004]

In view of the above situation, the present inventor has considered to prevent a spark generated at the time of welding by forming a protective wall at a required portion around the welding work place. , At various sites, building pillars,
Due to the existence of aggregates or the individual conditions that the size of the installation space is uncertain, it has been necessary to admit that it is practically impossible to use a rigid body such as a metal panel of a specific size. Further, in the case of such a rigid wall, there is a problem that when a spark scattered vigorously collides with the rigid wall, the rigid wall rebounds greatly and does not eliminate the danger.

[0005] Therefore, a flexible protective sheet (as a wall or a floor) has been considered so that it can be easily expanded or contracted in a large or small space such as a furoshiki. Initially, a single sheet of cloth was used as the protective sheet. However, it was confirmed that the sheet could easily be ignited by high-temperature sparks, and it could not be used as a protective sheet for welding. Therefore, when a nonwoven sheet made of glass fiber with excellent heat resistance was used, the ignition phenomenon did not occur when sparks came into contact (there could be local melting). The situation that it goes out of the outside occurred.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a welding protection sheet which does not ignite a spark of welding and does not repel it.

[0007]

In order to achieve the above object, a welding protection sheet according to the present invention is a welding protection sheet having flexibility, which is a material for a base layer 2 made of a heat-resistant material. At least one side is provided with a means for providing a spark intake layer 1 made of a nonflammable fusible material through which welding sparks can penetrate.

[0008] In the present invention, the above-mentioned spark take-up layer 1
Is preferably composed of a surface film 1a and a partitioned void layer 1b below the surface film 1a.

In the present invention, it is preferable that the above-mentioned spark-trapping layer 1 is made of a foam material 1c.

[0010]

According to the present invention, when this protective sheet is used for, for example, frame welding or fusing at a building construction site as shown in FIG.
The spark take-in layer 1 is stretched toward a work site side at a required portion as a side wall equivalent portion. When the spark generated by welding (fusing) scatters and collides with the spark capturing layer 1 of the protective sheet, the spark capturing layer 1 is made of a nonflammable fusible material through which welding sparks can penetrate. Sparks enter inside by high-temperature melting without being repelled.

The spark that has entered the inside of the spark take-up layer 1 is deprived of heat by its melting and reaches the base layer 2 made of a heat-resistant material. Then, the spark (scale or the like) is fixed inside the spark capturing layer 1 by cooling the spark capturing layer 1. If used several times, the surface of the spark take-up layer 1 becomes full of holes due to spark penetration, but if this occurs, it will be disposable.
In addition, since a sound absorbing effect can be expected in terms of structure, a soundproofing effect can be exerted depending on the installation location.

[0012] The spark-trapping layer 1 comprises a surface film 1a,
In the case of being composed of the divided lower gap layer 1b below the surface coating 1a, cooling progresses when the sparks melt and pass through the separated gap layer 1b sequentially after melting through the surface coating 1a. As a result, a stepwise deceleration action can be expected, and the rebound prevention action increases.

[0013] Similarly, when the above-mentioned spark take-up layer 1 is made of a foamed material 1c, the sparks are not covered by the foamed material 1c.
Each time the bubbles are sequentially melted and penetrated, the cooling is facilitated, and a stepwise deceleration action can be expected, thereby increasing the rebound prevention action.

In the present invention, when the above-mentioned spark-intake layer 1 is provided on both sides of the base layer 2, either side may be stretched toward the welding work site, and the laying work is simplified. . As a heat-resistant material of the base layer 2, for example, a sheet material such as a polyamide-based, polycarbonate-based, denatured PPE, or poly-ester having high heat resistance can be used as a synthetic resin material. In addition, if the base layer 2 can exhibit flexibility and is nonflammable, another known material, for example, a metal foil such as aluminum or a heat-resistant FRP may be used as appropriate.

The above-mentioned spark take-up layer 1 may be any material which is nonflammable with respect to sparks and can be melted. For example, urethane foam or styrene foam can be used as a synthetic resin material. This spark uptake layer 1
In order to increase the cooling effect of the spark and the cushioning action for preventing the rebound at the time of the collision with the spark, the void layer 1b is structurally used or the foam material having the void itself is used.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a protective sheet for welding according to the present invention will be described below in detail with reference to the drawings. First Embodiment As shown in an enlarged vertical cross section in FIG. 1, here, on both sides of a base layer 2 made of a heat-resistant synthetic resin material (modified PPE), a surface film 1a and a lower layer of the surface film 1a are partitioned. Void layer 1
b, and the spark take-up layer 1 is provided in an integrated state. The spark take-up layer 1 is made of a nonflammable fusible material through which a welding spark can penetrate, in this case, thermoplastic polyester.

As shown in FIG. 2, a string 3 for fixing at a welding site is attached to a required portion around the protective sheet, and is attached to a steel frame at a building construction site as shown in FIG. The installation workability, which facilitates the installation, is improved.
Further, when the soundproofing wall 4 is installed on the roadway boundary, the structure described above has a sound absorbing effect, so that it can also function as a soundproofing wall.

Second Embodiment As shown in an enlarged vertical cross section in FIG. 3, this embodiment comprises a foam material 1c on both sides of a base layer 2 of a heat-resistant synthetic resin material (modified PPE). The provided spark taking layer 1 is provided in an integrated state. This foam material 1c is a nonflammable fusible material through which welding sparks can pass,
Here, it is composed of urethane foam in which bubbles have developed. Note that, similarly to the first embodiment, the protective sheet is provided with means such as a string and a hook for easily laying and fixing at the welding site.

[0019]

According to the protective sheet for welding according to the present invention, the welding spark is once taken into the inside by melting and penetration of the sheet surface portion and cooled, so that the spark can be received without repelling and the spark scattering can be welded. It can be limited to the local part of the work place, and it is possible to avoid the danger to other workers in the vicinity or the traffic of the worker downstairs, and to temporarily evacuate other workers during welding (fusing) work. As a result, a remarkable operation and effect can be achieved in that the work stoppage accompanying this can be avoided beforehand and ignition of other combustibles can be prevented. Also, when used as a safety wall, which is the boundary between the building site and the road, it has the advantage of simultaneously exhibiting soundproofing effects and can be made of inexpensive sheet material. Workability is good.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view of a welding protection sheet according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a welding protection sheet according to the first embodiment of the present invention.

FIG. 3 is an enlarged longitudinal sectional view of a welding protection sheet according to a second embodiment of the present invention.

FIG. 4 is a schematic side view showing a use state of the protective sheet for welding according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spark taking layer 1a Surface film 1b Void layer 1c Foam material 2 Base layer

Claims (3)

[Claims] 1. A welding protection sheet comprising a base layer 2 made of a heat-resistant material and a spark take-up layer 1 made of a nonflammable fusible material through which welding sparks can penetrate. 2. A method according to claim 1, wherein said spark-trapping layer comprises:
2. The welding protective sheet according to claim 1, wherein said protective sheet is composed of a partitioned lower gap layer 1b. 3. The welding protection sheet according to claim 1, wherein said spark take-up layer 1 is made of a foam material 1c.